... Such projections are suitable for direct comparison with radio data (such as produced by AIPS), X-ray observations (e.g., ximage), optical, and IR. ... In N-body simulations, we model bulk gas, heated gas, and stars as individual particles in three-dimensional space. ... The issue of how to match a simulation to an observation runs into an interesting limitation, as finding the slice of time that corresponds to `now' is a necessary step in creating the pseudo-observation. ...